Highest Common Factor (HCF)
This lesson covers:
- How to find the highest common factor (HCF) of a pair of numbers, by comparing lists of each numbers factors.
- How to find the HCF of a pair of numbers by comparing their prime factors.
Find the highest common factor (HCF) of 24 and 32.
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Find the highest common factor (HCF) of 12 and 18.
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Find the highest common factor (HCF) of 75 and 90.
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Find the highest common factor (HCF) of 32 and 80.
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Below are the numbers 56 and 98, expressed as products of their prime factors:
56 = 2 x 2 x 2 x 7
98 = 2 x 7 x 7
Use these to find the highest common factor (HCF) of 56 and 98.
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Below are the numbers 84 and 180, expressed as products of their prime factors:
84 = 2 x 2 x 3 x 7
180 = 2 x 2 x 3 x 3 x 5
Use these to find the highest common factor (HCF) of 84 and 180.
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Below are the numbers 32 and 80, expressed as products of their prime factors:
32 = 2 x 2 x 2 x 2 x 2
80 = 2 x 2 x 2 x 2 x 5
Use these to find the highest common factor (HCF) of 32 and 80.
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